When a player lost in time, he can get draw if his opponent doesnt win the game even with the worst play. But in this situation, with the worst play of White, he can be checkmated !

Is it a "bug" of Chesscube or it's allowed by the FIDE's rules ?

Thanks for your reading.

This is ChessCube interpretation of the FIDE rules. It would not be feasible to program in every possible case into the software, so the system simply determines that if you have only a knight and a king that it will be declared a draw. The draw rules are clearly posted elsewhere in these forums.